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Figure 5.1 (A) Longitudinal section through simple plasmodesmata between adjacent parenchyma
cells of potato tuber. ER, endoplasmic reticulum; DT, desmotubule; CW, cell wall. Bar: 25 nm. (B)
Transverse section through simple plasmodesmata between parenchyma cells of potato tuber, showing
the desmotubule and the plasma membrane. The central electron dense dot is thought to be formed by
the appressed hydrophilic phospholipid head groups of the inner leaflet of the desmotubule. The
cytoplasmic sleeve appears to be partially occluded; this is thought to be due to gobular subunits
surrounding the desmotubule. PM, plasma membrane; CS, cytoplasmic sleeve. Bar: 20 nm. (C)
Longitudinal section through branched plasmodesmata between parenchyma cells of potato tuber.
Multiple branches can be seen extending from median central cavities. CC, central cavity; CW, cell
wall; ER, endoplasmic reticulum. Bar: 25 nm.
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